Magnetic vibrator.



Patented Sept. 22, 1914.

2 SHEETSSHBET l.

Inventor Attorneys F. V. SMITH.

MAGNETIC VIBRATOR. APPLICATION FILED Nov, 28, 1911.

F. V. SMITH.

MAGNETIC VIBRATOR.

APPLICATION FILED NOV. 28, 1am.

1,1 1 1,038 Patented Sept. 22, 1914.

2 SHEETSSHEET 2.

Inventor I I I D Attorneysl FRANK V. SMITH, OFFLORISTON, CALIFORNIA.

MAGNETIC VIBRATOR.

Specification of Letters Patent.

Patented Sept. 22, 1914.

Application filed November 28, 1911. Serial No. 662,951.

To all whom it may concern:

Be it known, that I, FRANK V. SMITH, a citizen of the United States,residing at Floriston, in the county of Nevada and State /of California,have invented a new and useful Magnetic Vibrator, of which the folpet.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of invention herein disclosed can be made within the scope ofwhat is claimed without departing from the spirit of the invention.

In the accompanying drawings,Figure 1 shows the invention inlongitudinal section; Fig. 2 is a side elevation; Fig. 3 is a top plan;Fig. 4 is a transverse section upon the line A-B of Fig. 1; and Figs. 5and 6 are diagrammatic views showing one method of wiring up the device,Fig. 5 showing, as an added detail, and in elevation, a switch wherebythe reciprocation of the tappet may be controlled.

In carrying out the invention there is provided a pair of spools,denoted by the numeral 1, the spools at one end being connected bya'base 2. Pole pieces 3 of a core 4 are thrust through the spools 1.vThe free ends of the pole pieces 3 extend through an insulating yoke 5which rests upon the spools 1.

Superposed upon the insulating yoke 5 is a hollow cover 6, having anoutstanding neck 7 and-flanges 8 which bear against the yoke 5. Anotherhollow cover 9 is shown, the samebeing equipped with an opening 10, in

alinement with theneck 7, the cover 9 having outstanding flanges 11which rest against theop osite ends of the spools 1, from those ends 0?the spools which receive the yoke'5. It is within the cover 9 that theintermediate portion of the core 4 is housed. The covers 9 and 6' arebound together by'bolt and nut structures 12, passingthrough the flanges11 An armature 14 is mounted to reciprocate 1n the cover 6, in closerelation to the free ends of pole pieces 3,. the armature l4 and thecore 4 preferably being of laminated construction. The invention furtherincludes a tappet 15, upon which the armature 14 is mounted, the tappethaving a threaded end 16, extended outwardly through the neck 7 of thecover 6, the opposite end of the tappet 15 lying between the spools 1.Threaded upon the portion 16 of the tappet 15 is a prlmary nut 17. Thisnut 17 is of polygonal contour, and registers slidably, but againstrotation, inan opening 18 in the yoke 5. This nut 17, designated, forconvenience, the primary nut, constitutes an abutment for the armature14. The armature 14 is bound against the primary nut 17 by a secondarynut 19, including a tubular neck 20, threaded to receive the portion 16of the tappet 15, the tubular neck 20 being slidable in the neck 7 ofthe cover 6. V

Surrounding the neck 7 of the cover 6, and abutting at one end againstthe cover, is a helical compression spring 21, the other end of which isreceived by a nut 22, mounted upon the threaded portion 16' of the tappet 15. The nut 22 is preferably split, radially, as shown at 23, toengage the threaded end 16 of thetappet closely, the construction.

being such that the nut 22 may be clamped upon the threaded end of thetappet, to pre-. vent a displacement of the nut, and a consequentalteration of the tension of the spring 21, when the device isin'operation. A re silient bufier 24 is secured to the inner face of thecover 6, and is adapted to IQCGIVQtll impact of the secondary nut 19,when-the armature 14 reciprocates.

The inner end of the tappet 15 is reduced and threaded, as shown at 25,to receive a case-hardened tip 26, mounted to slide ma tubular socket27, formed upon one endo f a tool-holder 28 which is slidably mounted inthe intermediate portion of the core4 and in' the opening 10 in thecover 9. Located within the socket 27, and secured thereinby means ofa'set-screw 29, is a case-hardened anvil 62, adapted'to' receive theblows of the tip 26. Removably secured, by threading or otherwise to theouter end of the tool-holder 2-8, ."is'achuck 30, adapted to receive atool 31,-the tool 31' being held-inplaoe 1n the chuck by means of aspring latch 32, or

. of the device, is a plate 34, carrying a double poled switch 35,adapted to cooperate, upon the one hand, with terminals 36 and 37, and

to cooperate, upon the other hand, with termin'als 38 and 39. Thewinding 40 which is upon one of the spools 1 is connected at one end, asshown at 41, with the terminal 37.

The other end of the winding 40 is connected as shown at 42, with one ofthe pivots is of the switch 35. The winding 43 which is upon the otherspool 1- is connected as shown at 44, with the terminal 36, the otherend of the winding 43 being connected as shown at 45, with the otherpivot 46 of the switch 35. A conductor 47 unites the pivot 48 of theswitch with the terminal 39.

The numeral 49 indicates, generally, any suitable source of alternatingcurrent, and

from the current source 49, a conductor 50 leads to the terminal 37. Aconductor 51 leads from the terminal 36 to one terminal of a switch,hereinafter described, and shown in Fig. 5, another conductor 52 leadingfrom the other terminal of the switch onto the line.

f The switch shown in Fig. 5 is mounted in the cover 6, the switch beingomitted from the showing of Fig. 1, for the sake of clearness. Mountedin the cover 6 is a fulcrum pin 53 upon which is mounted'for swingingmovement, a lever 54, there being buttons 55 and 56 pivotally connectedwith the lever 54, upon opposite sides of the fulcrum pin 53. Thesebuttons 55 and 56 protrude outwardly, through one end of the cover 6.Pivotally connected, with-the inner. end of-the lever 54,- by means of aknuckle joint 57 is a switch blade 58, adapted to engage beneath aspring contact 59. The conductor 51 is connected with the fulcrum pin53, and the conductor 52 is connected. with the spring contact 59. Anarched spring 63 is secured to the switch blade 58, and bears againstthe lever 54.

Secured to the cover .6 is a plate 60, having an outstanding handle 61,the construction being such that when the member 61 is in the hand ofthe operator, the thumb of the operator will be disposed in convenientrelation with respect to the buttons 55 and 56.

The operation of the device is as follows. When the magnets areenergized, the armature 14 will be attracted, and the spring 21 will beput under tension, the tension of the spring being adjusted through .themedium of the nut 22. When the potential of the alternating currentfalls, during the reversal of the current, so thatthe pulling efiect ofthe electro-magnets upon the armature 14 is no longer greater than thethrusting effect of the spring 21, the spring 21, acting against the nut22, will move the armature 14 away from the magnets. In practice, theforegoing operation will take place with eat rapidity, causing the. tapet 15 to reciprocate at a high rate of spec ,within the socket 27 of thetool-holder 28. The tool-holder 28 and the tool 31 will not, however, bereciprocated, unless the tool 31 is thrust against the work withsuflicient pressure to compress the spring 33, and to move thetoolholder 28 inwardly. When the tool-holder 28 is thus moved inwardly,the tool-holder will receive a series of rapid blows from the tappet 15,through the cotiperation of the tip 26 which is carried by the tappet15, and the anvil 62 which is carried by the toolholder 28. I

Theprimary nut 17 has three separate and distinct functions. Primarily,it constitutes an abutment for the armature 14; it also serves as aguide, reciprocating in the yoke 5; furthermore, owing to the fact thatthe nut 17 registers against rotation in the opening 18 in the yoke 5,the nut constitutes a means for preventing a rotation of the tappet 15.The secondary nut 19 serves to bind the armature 14 against nut- 17, andthe portion 20 of the nut 19, sliding within the neck 7 of the cover 6,serves as a bearin The switch 35 constitutes a means w ereby the magnetsmay be yoked up parallel or in series, it bein frequently necessary,upon fine work, to t row the magnets into series, in order to reduce thepower sufliciently to permit the consummationof fine details in stonecarving, and like work.

In Fig. 5, the coils are shown in parallel, the circuits being asfollows :The source ofcurrent supply 49, the conductor 50, the terminal37, one arm of the switch 35, the terminal 46, the conductor 45, the win43, the conductor 44, the terminal 36, an thence ontothe line by theconductor 51. From the terminal 37 there is established another circuitas follows :--the terminal 87, the conductor 41, the winding 40, theconductor 42, the pivot member 48, one arm of the switch 35,- andthence'through the terminal 36 onto the line conductor 51.

When the magnets are yoked up in series, as shown in Fig. 6 the circuitis as follows the source of current supply 49, the conduetor 50, theconductor 41, the winding-A0 of the one magnet, the conductor 42, thepivot element 48, the conductor 47, the terminal 39, one blade of theswitch 35, the pivot member 46, the conductor 45, the winding 43 of theother magnet, the conductor 44, the terminal 36, and thence onto the.line conductor 51. A

will be readily understood the buttons 1 30 quencies ranging 55 and 56constitute a means whereby the circuit through the structure may bebroken at any time, for the purpose of destroying an are or otherwise.The switch shown in Fig. 5, of which switch the buttons 55 and has beenput under tension. Presupposing that the spring 63, in Fig. 5, has beenput under a tension equal to the frictional hold of the spring contact59 upon the switch blade 58, it will be understood that when the button56 is pushed inwardly to a slightly greater extent than shown, thespring 63 will act against the switch blade 58, to break the circuit atthe members 58 and 59, this break occurring with great abruptness. The

switch shown in Fig. 5 and above described,

may be positioned variously. But, in the present instance, for the sakeof illustration, one portion 51 of the line conductor has been connectedwith the pivot 53, an-

other portion 52- of the line conductor being connected with the contact59.

The structure herein disclosed is designed to operate in an alternatingcurrent, at any commercial lightin voltage, and on frerom 15 to 125cycles. The structure will develop an exceedingly high speed of.vibration in the tappet 15, and will be found of use in all cases whereitis desired to impart a series of rapid blows,

85 against a tool-carrying member.

Having thus described the invention, what is claimed is I 1. In a deviceof the class described, a supporting structure including anelectromagnet; a tappet; an armature on the tappet and responsive to theelectromagnet; and spaced elements mounted upon the tappet adjust-ablyand engaging the armature, to adjust the position of thearmature withrespect to the electromagnet, said elements being slidably received inthe supporting structure to form bearings for the ta pet.

2. In 'a device of the class descrlbed, a supporting structure includingan electromagnet; a yoke in which one end of the electroma et isengaged; a cover secured to the yo e; a tappet slidable in the cover; anarmature upon the tapped-responsive to the electromagnet; a primary nutthreaded upon the tappet and constituting an abutment for one side ofthe armature, the primary 'nut being slidable in the yoke, and beingengaged in the yoke against rotation; and a secondary nut t readed uponthe tappet, and adapted to bind the armature against the primary nut,the secondary nut being slidably mounted in thecover.

In testimony that I claim the foregoing as my own, I have hereto aflixedmy s1gna-' ture in the presence of two witnesses.

F. V. SMITH.

Witnesses:

E. D. BROWN, E. G. H01.

